Help me.......What is the 6SN7 ???????

cd149dc · 16th June 2007, 09:24 AM

Hello,

Anyone could tell me what version of 6SN7 tube.

Thank you so much,

gianis · 16th June 2007, 09:17 PM

6sn7 with ceramic elements???? Strange to me.....

anatech · 16th June 2007, 09:20 PM

Hi cd149dc,
I've never seen one like that either. It may be industrial, military or remarked Russian for all I know. If it is really a 6SN7, I'll bet it is not microphonic. Have you tried it in anything?

-Chris

Colt45 · 16th June 2007, 10:02 PM

Never seen it before. what does the stamp on the side say.. i cant see from the pictures.

anything on the bottom of the base?

Johan Potgieter · 16th June 2007, 11:32 PM

Ditto here.

Geometry looks like classic 6SN7 (have a normal one here), with anode surface somewhat larger. I guess that it is somehow a higher anode dissipation type, or designed to work in very hot areas plus perhaps conditions of vibration/shock.

Cd149dc, can you tell us where you found it or any more information? Most interested.

ilimzn · 17th June 2007, 11:25 AM

East German military 6SN7 (often has both US and russian markings) made by WF. I have a couple of those with the original labeling intact, it comes above the 6SN7 mark on yours. I'm not sure the elements are ceramic, but rather something like compressed mica. Still, they work very well...

Brian Beck · 17th June 2007, 02:11 PM

Very interesting tube. I've collected a lot of different 6SN7s, but I've never seen one like that. The ceramic support wafers have that "Red Bank" appeal.

As Johan suggests, the larger radiator fins coming off both sides of the plates ought to give a larger plate dissipation rating, all else being equal.

Ilimzn or cd149dc, do either of you have the East German part number, and the data sheet associated with it? I'm curious about how similar this tube is to a regular 6SN7.

jacco vermeulen · 17th June 2007, 02:27 PM

A picture of the Werk Fernmeldewesen type is
here

Maybe the previous owner no longer appreciated the Russian type marking.

Brian Beck · 17th June 2007, 03:49 PM

Jacco's linked photo shows dual markings: 6H8C and 6SN7. The data sheet for the 6H8C suggests a near equivalent to the 6SN7. Max plate voltage and dissipation ratings are lower, surprisingly. Whether the 6H8C shares the fabled linearity of the 6SN7, I can't say.

6H8C data sheet

anatech · 17th June 2007, 04:42 PM

Hi Brian, Jacco,
That make sense.

Thank you for pointing out the datasheets.

-Chris

16th June 2007, 09:24 AM	#1
cd149dc diyAudio Member Join Date: Mar 2006 Location: Ha Noi	Help me.......What is the 6SN7 ??????? Hello, Anyone could tell me what version of 6SN7 tube. Thank you so much, __________________ DIY forever

16th June 2007, 09:17 PM	#2
gianis diyAudio Member Join Date: Jan 2004 Location: athens	6SN7 6sn7 with ceramic elements???? Strange to me.....

16th June 2007, 09:20 PM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi cd149dc, I've never seen one like that either. It may be industrial, military or remarked Russian for all I know. If it is really a 6SN7, I'll bet it is not microphonic. Have you tried it in anything? -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

17th June 2007, 02:11 PM	#7
Brian Beck diyAudio Member Join Date: Dec 2004 Location: South Florida, USA	Very interesting tube. I've collected a lot of different 6SN7s, but I've never seen one like that. The ceramic support wafers have that "Red Bank" appeal. As Johan suggests, the larger radiator fins coming off both sides of the plates ought to give a larger plate dissipation rating, all else being equal. Ilimzn or cd149dc, do either of you have the East German part number, and the data sheet associated with it? I'm curious about how similar this tube is to a regular 6SN7. __________________ Brian

17th June 2007, 02:27 PM	#8
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	A picture of the Werk Fernmeldewesen type is here Maybe the previous owner no longer appreciated the Russian type marking. __________________ As a participant to a public forum, you should know that nobody owes you anything here, not even an answer.


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16th June 2007, 10:02 PM	#4
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	Never seen it before. what does the stamp on the side say.. i cant see from the pictures. anything on the bottom of the base?

16th June 2007, 11:32 PM	#5
Johan Potgieter diyAudio Member Join Date: May 2005 Location: Pretoria, South Africa	Ditto here. Geometry looks like classic 6SN7 (have a normal one here), with anode surface somewhat larger. I guess that it is somehow a higher anode dissipation type, or designed to work in very hot areas plus perhaps conditions of vibration/shock. Cd149dc, can you tell us where you found it or any more information? Most interested.

17th June 2007, 11:25 AM	#6
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	East German military 6SN7 (often has both US and russian markings) made by WF. I have a couple of those with the original labeling intact, it comes above the 6SN7 mark on yours. I'm not sure the elements are ceramic, but rather something like compressed mica. Still, they work very well...

17th June 2007, 03:49 PM	#9
Brian Beck diyAudio Member Join Date: Dec 2004 Location: South Florida, USA	Jacco's linked photo shows dual markings: 6H8C and 6SN7. The data sheet for the 6H8C suggests a near equivalent to the 6SN7. Max plate voltage and dissipation ratings are lower, surprisingly. Whether the 6H8C shares the fabled linearity of the 6SN7, I can't say. 6H8C data sheet __________________ Brian

17th June 2007, 04:42 PM	#10
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Brian, Jacco, That make sense. Thank you for pointing out the datasheets. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

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